Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia
A coil probe (CP) for time-domain reflectometry (TDR) with a sensor length of 40 mm (CP 40 ) was developed for long-term field soil moisture measurements in a thin surface soil layer (0–3 cm depth). In laboratory, soil moisture measurements of CP 40 were nearly identical to those of a traditional tw...
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2024
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ftalborgunivpubl:oai:pure.atira.dk:publications/083994b0-9a4a-4ebb-96c7-a1e7374ab304 2024-09-15T18:30:11+00:00 Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia Kaihotsu, Ichirow Nissen, Henrik Hoffman Aida, Kentaro Asanuma, Jun Hirose, Nozomu Møldrup, Per 2024-07 application/pdf https://vbn.aau.dk/da/publications/083994b0-9a4a-4ebb-96c7-a1e7374ab304 https://doi.org/10.1007/s42452-024-06006-w https://vbn.aau.dk/ws/files/721914248/s42452-024-06006-w.pdf http://www.scopus.com/inward/record.url?scp=85196664423&partnerID=8YFLogxK eng eng https://vbn.aau.dk/da/publications/083994b0-9a4a-4ebb-96c7-a1e7374ab304 info:eu-repo/semantics/openAccess Kaihotsu , I , Nissen , H H , Aida , K , Asanuma , J , Hirose , N & Møldrup , P 2024 , ' Time domain reflectometry coil probes for measuring thin surface layer soil moisture : Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia ' , Discover Applied Sciences , vol. 6 , 339 . https://doi.org/10.1007/s42452-024-06006-w Long-term field soil moisture measurement Millimeter-scale TDR probe Mongolia Natural environmental change Thin surface soil layer article 2024 ftalborgunivpubl https://doi.org/10.1007/s42452-024-06006-w 2024-09-05T14:36:16Z A coil probe (CP) for time-domain reflectometry (TDR) with a sensor length of 40 mm (CP 40 ) was developed for long-term field soil moisture measurements in a thin surface soil layer (0–3 cm depth). In laboratory, soil moisture measurements of CP 40 were nearly identical to those of a traditional two-rod type TDR (2RTDR) probe (rod length: 15 cm, diameter: 0.3 cm, spacing: 3 cm). The CP 40 measurement accuracy was between 0.01 m 3 /m 3 and 0.03 m 3 /m 3 . For long-term field soil moisture measurements, five CP 40 units were installed in the highly wetted soil at the Sanzai site (SS), which is in the permafrost area of the Taiga, and dry soil at the Mandalgobi site (MGS) in the semi-arid area of Mongolia. Four units accurately measured soil moisture at both sites over six years (2002–2007and 2008–2009). Three units succeeded in conducting precisely continuous soil moisture measurements between 2008 and 2022 at the MGS. Two units successfully measured soil moisture over 21 years at both the sites. The representativeness of the CP 40 soil moisture measurements in highly wetted soils was low because of heavy rainfall and soil heterogeneity. The accuracy of CP 40 soil moisture measurements in highly wetted soils was slightly lower than that of the traditional 2RTDR probe. However, the accuracy of the CP 40 soil-moisture measurements in the dry soil was comparable to that of the traditional 2RTDR probe. CP 40 units are durable and their field soil moisture measurements demonstrate stable and precise performance (bias, RMSE), even under severe environmental conditions. Article in Journal/Newspaper permafrost taiga Aalborg University's Research Portal Discover Applied Sciences 6 7 |
institution |
Open Polar |
collection |
Aalborg University's Research Portal |
op_collection_id |
ftalborgunivpubl |
language |
English |
topic |
Long-term field soil moisture measurement Millimeter-scale TDR probe Mongolia Natural environmental change Thin surface soil layer |
spellingShingle |
Long-term field soil moisture measurement Millimeter-scale TDR probe Mongolia Natural environmental change Thin surface soil layer Kaihotsu, Ichirow Nissen, Henrik Hoffman Aida, Kentaro Asanuma, Jun Hirose, Nozomu Møldrup, Per Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
topic_facet |
Long-term field soil moisture measurement Millimeter-scale TDR probe Mongolia Natural environmental change Thin surface soil layer |
description |
A coil probe (CP) for time-domain reflectometry (TDR) with a sensor length of 40 mm (CP 40 ) was developed for long-term field soil moisture measurements in a thin surface soil layer (0–3 cm depth). In laboratory, soil moisture measurements of CP 40 were nearly identical to those of a traditional two-rod type TDR (2RTDR) probe (rod length: 15 cm, diameter: 0.3 cm, spacing: 3 cm). The CP 40 measurement accuracy was between 0.01 m 3 /m 3 and 0.03 m 3 /m 3 . For long-term field soil moisture measurements, five CP 40 units were installed in the highly wetted soil at the Sanzai site (SS), which is in the permafrost area of the Taiga, and dry soil at the Mandalgobi site (MGS) in the semi-arid area of Mongolia. Four units accurately measured soil moisture at both sites over six years (2002–2007and 2008–2009). Three units succeeded in conducting precisely continuous soil moisture measurements between 2008 and 2022 at the MGS. Two units successfully measured soil moisture over 21 years at both the sites. The representativeness of the CP 40 soil moisture measurements in highly wetted soils was low because of heavy rainfall and soil heterogeneity. The accuracy of CP 40 soil moisture measurements in highly wetted soils was slightly lower than that of the traditional 2RTDR probe. However, the accuracy of the CP 40 soil-moisture measurements in the dry soil was comparable to that of the traditional 2RTDR probe. CP 40 units are durable and their field soil moisture measurements demonstrate stable and precise performance (bias, RMSE), even under severe environmental conditions. |
format |
Article in Journal/Newspaper |
author |
Kaihotsu, Ichirow Nissen, Henrik Hoffman Aida, Kentaro Asanuma, Jun Hirose, Nozomu Møldrup, Per |
author_facet |
Kaihotsu, Ichirow Nissen, Henrik Hoffman Aida, Kentaro Asanuma, Jun Hirose, Nozomu Møldrup, Per |
author_sort |
Kaihotsu, Ichirow |
title |
Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
title_short |
Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
title_full |
Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
title_fullStr |
Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
title_full_unstemmed |
Time domain reflectometry coil probes for measuring thin surface layer soil moisture:Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia |
title_sort |
time domain reflectometry coil probes for measuring thin surface layer soil moisture:field tests over 21 years (2002–2022) under highly variable climate conditions in mongolia |
publishDate |
2024 |
url |
https://vbn.aau.dk/da/publications/083994b0-9a4a-4ebb-96c7-a1e7374ab304 https://doi.org/10.1007/s42452-024-06006-w https://vbn.aau.dk/ws/files/721914248/s42452-024-06006-w.pdf http://www.scopus.com/inward/record.url?scp=85196664423&partnerID=8YFLogxK |
genre |
permafrost taiga |
genre_facet |
permafrost taiga |
op_source |
Kaihotsu , I , Nissen , H H , Aida , K , Asanuma , J , Hirose , N & Møldrup , P 2024 , ' Time domain reflectometry coil probes for measuring thin surface layer soil moisture : Field tests over 21 years (2002–2022) under highly variable climate conditions in Mongolia ' , Discover Applied Sciences , vol. 6 , 339 . https://doi.org/10.1007/s42452-024-06006-w |
op_relation |
https://vbn.aau.dk/da/publications/083994b0-9a4a-4ebb-96c7-a1e7374ab304 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s42452-024-06006-w |
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